It is not uncommon for the last-translator to be the same. We wouldn't want to lose that (and if we did, we wouldn't even have to worry about hashes or anything: we'd have both a DB value and an actual value from a PO file at hand, which we could easily compare).
Also, external tools already support Last-Translator (any good PO file editor will set it automatically, but people sometimes update PO files in bare text editors or "bad" PO editors).
It is not uncommon for the last-translator to be the same. We wouldn't want to lose that (and if we did, we wouldn't even have to worry about hashes or anything: we'd have both a DB value and an actual value from a PO file at hand, which we could easily compare).
Also, external tools already support Last-Translator (any good PO file editor will set it automatically, but people sometimes update PO files in bare text editors or "bad" PO editors).